Just like the chair you're sitting in is stationary according to your frame of reference, while from another it is hurtling through space.
Just like the chair you're sitting in is stationary according to your frame of reference, while from another it is hurtling through space.
There's no such thing as a "normal" frame of reference.
> the geocentricists tried to build mechanical models but the increasing number of epicycles was a big clue that the system was in fact heliocentric.
Not exactly, it was a big clue that the planets did not move in perfect circles. The mechanical models did not provide any evidence of heliocentrism. It was Galileo's observations of Venus that torpedoed the geocentric theory.
[1] http://tofspot.blogspot.com/2013/08/the-great-ptolemaic-smac...
A rotating reference frame is different. A local experiment can tell you whether you're rotating and how fast you're rotating.
The Sun has a certain mass, the Earth has a certain mass, the center of the point of orbit of both (barycenter? That seems to be the right term) is inside of the Sun no matter what frame you hang out in. What am I missing?
Such as the word "sunrise" is very geocentric. We don't even have a word for the heliocentric term for the same thing. We also use geocentric phrases like "jets chasing the Sun" and "sundials track the movement of the Sun", etc.
Yes. It's what I've been talking about in this thread. You could always, of course, demand that the local TV station change the word "sunrise" to "when the Earth rotates until the Sun shines on the TV station", but I suspect that won't be successful.
I bet you have. From your frame of reference, the Sun revolves around the Earth.
I also bet if I asked you "which direction should be a rocket be launched into earth orbit to minimize fuel consumption" you'll have to stop and think about it.